Mercurial > dropbear

annotate src/ciphers/rc5.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +0000
parents 1c15b283127b
children 39d5d58461d6
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191
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11
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12 /**
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13 @file rc5.c
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14 RC5 code by Tom St Denis
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15 */
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16
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17 #include "tomcrypt.h"
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18
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19 #ifdef RC5
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20
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21 const struct ltc_cipher_descriptor rc5_desc =
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22 {
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23 "rc5",
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24 2,
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25 8, 128, 8, 12,
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26 &rc5_setup,
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27 &rc5_ecb_encrypt,
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28 &rc5_ecb_decrypt,
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29 &rc5_test,
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30 &rc5_done,
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31 &rc5_keysize,
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32 NULL, NULL, NULL, NULL, NULL, NULL, NULL
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33 };
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34
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35 static const ulong32 stab[50] = {
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36 0xb7e15163UL, 0x5618cb1cUL, 0xf45044d5UL, 0x9287be8eUL, 0x30bf3847UL, 0xcef6b200UL, 0x6d2e2bb9UL, 0x0b65a572UL,
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37 0xa99d1f2bUL, 0x47d498e4UL, 0xe60c129dUL, 0x84438c56UL, 0x227b060fUL, 0xc0b27fc8UL, 0x5ee9f981UL, 0xfd21733aUL,
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38 0x9b58ecf3UL, 0x399066acUL, 0xd7c7e065UL, 0x75ff5a1eUL, 0x1436d3d7UL, 0xb26e4d90UL, 0x50a5c749UL, 0xeedd4102UL,
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39 0x8d14babbUL, 0x2b4c3474UL, 0xc983ae2dUL, 0x67bb27e6UL, 0x05f2a19fUL, 0xa42a1b58UL, 0x42619511UL, 0xe0990ecaUL,
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40 0x7ed08883UL, 0x1d08023cUL, 0xbb3f7bf5UL, 0x5976f5aeUL, 0xf7ae6f67UL, 0x95e5e920UL, 0x341d62d9UL, 0xd254dc92UL,
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41 0x708c564bUL, 0x0ec3d004UL, 0xacfb49bdUL, 0x4b32c376UL, 0xe96a3d2fUL, 0x87a1b6e8UL, 0x25d930a1UL, 0xc410aa5aUL,
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42 0x62482413UL, 0x007f9dccUL
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43 };
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44
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45 /**
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46 Initialize the RC5 block cipher
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47 @param key The symmetric key you wish to pass
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48 @param keylen The key length in bytes
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49 @param num_rounds The number of rounds desired (0 for default)
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50 @param skey The key in as scheduled by this function.
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51 @return CRYPT_OK if successful
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52 */
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53 #ifdef LTC_CLEAN_STACK
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54 static int _rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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55 #else
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56 int rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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57 #endif
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58 {
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59 ulong32 L[64], *S, A, B, i, j, v, s, t, l;
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60
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61 LTC_ARGCHK(skey != NULL);
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62 LTC_ARGCHK(key != NULL);
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63
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64 /* test parameters */
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65 if (num_rounds == 0) {
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66 num_rounds = rc5_desc.default_rounds;
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67 }
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68
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69 if (num_rounds < 12 || num_rounds > 24) {
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70 return CRYPT_INVALID_ROUNDS;
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71 }
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72
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73 /* key must be between 64 and 1024 bits */
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74 if (keylen < 8 || keylen > 128) {
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75 return CRYPT_INVALID_KEYSIZE;
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76 }
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77
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78 skey->rc5.rounds = num_rounds;
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79 S = skey->rc5.K;
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80
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81 /* copy the key into the L array */
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82 for (A = i = j = 0; i < (ulong32)keylen; ) {
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83 A = (A << 8) | ((ulong32)(key[i++] & 255));
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84 if ((i & 3) == 0) {
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85 L[j++] = BSWAP(A);
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86 A = 0;
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87 }
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88 }
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89
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90 if ((keylen & 3) != 0) {
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91 A <<= (ulong32)((8 * (4 - (keylen&3))));
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92 L[j++] = BSWAP(A);
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93 }
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94
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95 /* setup the S array */
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96 t = (ulong32)(2 * (num_rounds + 1));
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97 XMEMCPY(S, stab, t * sizeof(*S));
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98
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99 /* mix buffer */
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100 s = 3 * MAX(t, j);
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101 l = j;
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102 for (A = B = i = j = v = 0; v < s; v++) {
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103 A = S[i] = ROLc(S[i] + A + B, 3);
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104 B = L[j] = ROL(L[j] + A + B, (A+B));
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105 if (++i == t) { i = 0; }
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106 if (++j == l) { j = 0; }
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107 }
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108 return CRYPT_OK;
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109 }
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110
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111 #ifdef LTC_CLEAN_STACK
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112 int rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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113 {
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114 int x;
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115 x = _rc5_setup(key, keylen, num_rounds, skey);
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116 burn_stack(sizeof(ulong32) * 122 + sizeof(int));
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117 return x;
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118 }
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119 #endif
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120
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121 /**
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122 Encrypts a block of text with RC5
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123 @param pt The input plaintext (8 bytes)
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124 @param ct The output ciphertext (8 bytes)
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125 @param skey The key as scheduled
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126 */
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127 #ifdef LTC_CLEAN_STACK
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128 static void _rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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129 #else
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130 void rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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131 #endif
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132 {
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diff changeset
133 ulong32 A, B, *K;
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diff changeset
134 int r;
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diff changeset
135 LTC_ARGCHK(skey != NULL);
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diff changeset
136 LTC_ARGCHK(pt != NULL);
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parents:
diff changeset
137 LTC_ARGCHK(ct != NULL);
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diff changeset
138
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diff changeset
139 LOAD32L(A, &pt[0]);
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parents:
diff changeset
140 LOAD32L(B, &pt[4]);
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diff changeset
141 A += skey->rc5.K[0];
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diff changeset
142 B += skey->rc5.K[1];
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parents:
diff changeset
143 K = skey->rc5.K + 2;
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diff changeset
144
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diff changeset
145 if ((skey->rc5.rounds & 1) == 0) {
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diff changeset
146 for (r = 0; r < skey->rc5.rounds; r += 2) {
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diff changeset
147 A = ROL(A ^ B, B) + K[0];
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diff changeset
148 B = ROL(B ^ A, A) + K[1];
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diff changeset
149 A = ROL(A ^ B, B) + K[2];
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diff changeset
150 B = ROL(B ^ A, A) + K[3];
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diff changeset
151 K += 4;
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parents:
diff changeset
152 }
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diff changeset
153 } else {
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diff changeset
154 for (r = 0; r < skey->rc5.rounds; r++) {
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diff changeset
155 A = ROL(A ^ B, B) + K[0];
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diff changeset
156 B = ROL(B ^ A, A) + K[1];
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diff changeset
157 K += 2;
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diff changeset
158 }
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diff changeset
159 }
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diff changeset
160 STORE32L(A, &ct[0]);
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parents:
diff changeset
161 STORE32L(B, &ct[4]);
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diff changeset
162 }
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diff changeset
163
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diff changeset
164 #ifdef LTC_CLEAN_STACK
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diff changeset
165 void rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
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166 {
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167 _rc5_ecb_encrypt(pt, ct, skey);
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168 burn_stack(sizeof(ulong32) * 2 + sizeof(int));
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169 }
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diff changeset
170 #endif
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diff changeset
171
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172 /**
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diff changeset
173 Decrypts a block of text with RC5
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diff changeset
174 @param ct The input ciphertext (8 bytes)
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diff changeset
175 @param pt The output plaintext (8 bytes)
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diff changeset
176 @param skey The key as scheduled
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diff changeset
177 */
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diff changeset
178 #ifdef LTC_CLEAN_STACK
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diff changeset
179 static void _rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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diff changeset
180 #else
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diff changeset
181 void rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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diff changeset
182 #endif
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diff changeset
183 {
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diff changeset
184 ulong32 A, B, *K;
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parents:
diff changeset
185 int r;
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diff changeset
186 LTC_ARGCHK(skey != NULL);
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parents:
diff changeset
187 LTC_ARGCHK(pt != NULL);
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diff changeset
188 LTC_ARGCHK(ct != NULL);
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diff changeset
189
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diff changeset
190 LOAD32L(A, &ct[0]);
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parents:
diff changeset
191 LOAD32L(B, &ct[4]);
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diff changeset
192 K = skey->rc5.K + (skey->rc5.rounds << 1);
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diff changeset
193
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diff changeset
194 if ((skey->rc5.rounds & 1) == 0) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 K -= 2;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 for (r = skey->rc5.rounds - 1; r >= 0; r -= 2) {
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parents:
diff changeset
197 B = ROR(B - K[3], A) ^ A;
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parents:
diff changeset
198 A = ROR(A - K[2], B) ^ B;
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diff changeset
199 B = ROR(B - K[1], A) ^ A;
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diff changeset
200 A = ROR(A - K[0], B) ^ B;
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parents:
diff changeset
201 K -= 4;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 } else {
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parents:
diff changeset
204 for (r = skey->rc5.rounds - 1; r >= 0; r--) {
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parents:
diff changeset
205 B = ROR(B - K[1], A) ^ A;
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parents:
diff changeset
206 A = ROR(A - K[0], B) ^ B;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 K -= 2;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 A -= skey->rc5.K[0];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 B -= skey->rc5.K[1];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 STORE32L(A, &pt[0]);
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parents:
diff changeset
213 STORE32L(B, &pt[4]);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 #ifdef LTC_CLEAN_STACK
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 void rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
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parents:
diff changeset
218 {
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parents:
diff changeset
219 _rc5_ecb_decrypt(ct, pt, skey);
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parents:
diff changeset
220 burn_stack(sizeof(ulong32) * 2 + sizeof(int));
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 /**
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parents:
diff changeset
225 Performs a self-test of the RC5 block cipher
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parents:
diff changeset
226 @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 int rc5_test(void)
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 #ifndef LTC_TEST
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parents:
diff changeset
231 return CRYPT_NOP;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 #else
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 static const struct {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 unsigned char key[16], pt[8], ct[8];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 } tests[] = {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 { 0x91, 0x5f, 0x46, 0x19, 0xbe, 0x41, 0xb2, 0x51,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 0x63, 0x55, 0xa5, 0x01, 0x10, 0xa9, 0xce, 0x91 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 { 0x21, 0xa5, 0xdb, 0xee, 0x15, 0x4b, 0x8f, 0x6d },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 { 0xf7, 0xc0, 0x13, 0xac, 0x5b, 0x2b, 0x89, 0x52 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 { 0x78, 0x33, 0x48, 0xe7, 0x5a, 0xeb, 0x0f, 0x2f,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 0xd7, 0xb1, 0x69, 0xbb, 0x8d, 0xc1, 0x67, 0x87 },
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 { 0xF7, 0xC0, 0x13, 0xAC, 0x5B, 0x2B, 0x89, 0x52 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 { 0x2F, 0x42, 0xB3, 0xB7, 0x03, 0x69, 0xFC, 0x92 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 { 0xDC, 0x49, 0xdb, 0x13, 0x75, 0xa5, 0x58, 0x4f,
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 0x64, 0x85, 0xb4, 0x13, 0xb5, 0xf1, 0x2b, 0xaf },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 { 0x2F, 0x42, 0xB3, 0xB7, 0x03, 0x69, 0xFC, 0x92 },
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 { 0x65, 0xc1, 0x78, 0xb2, 0x84, 0xd1, 0x97, 0xcc }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 };
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 unsigned char tmp[2][8];
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 int x, y, err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 symmetric_key key;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 for (x = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 /* setup key */
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 if ((err = rc5_setup(tests[x].key, 16, 12, &key)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 return err;
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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264
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265 /* encrypt and decrypt */
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266 rc5_ecb_encrypt(tests[x].pt, tmp[0], &key);
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267 rc5_ecb_decrypt(tmp[0], tmp[1], &key);
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268
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269 /* compare */
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270 if (memcmp(tmp[0], tests[x].ct, 8) != 0 || memcmp(tmp[1], tests[x].pt, 8) != 0) {
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271 return CRYPT_FAIL_TESTVECTOR;
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272 }
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273
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274 /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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275 for (y = 0; y < 8; y++) tmp[0][y] = 0;
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276 for (y = 0; y < 1000; y++) rc5_ecb_encrypt(tmp[0], tmp[0], &key);
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277 for (y = 0; y < 1000; y++) rc5_ecb_decrypt(tmp[0], tmp[0], &key);
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278 for (y = 0; y < 8; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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279 }
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280 return CRYPT_OK;
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281 #endif
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282 }
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283
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284 /** Terminate the context
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285 @param skey The scheduled key
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286 */
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287 void rc5_done(symmetric_key *skey)
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288 {
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289 }
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290
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291 /**
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292 Gets suitable key size
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293 @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable.
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294 @return CRYPT_OK if the input key size is acceptable.
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295 */
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296 int rc5_keysize(int *keysize)
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297 {
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298 LTC_ARGCHK(keysize != NULL);
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299 if (*keysize < 8) {
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300 return CRYPT_INVALID_KEYSIZE;
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301 } else if (*keysize > 128) {
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302 *keysize = 128;
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303 }
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304 return CRYPT_OK;
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305 }
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306
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307 #endif
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308
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309
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310